High-alkalinity and low-reactivity continuous casting mold flux for high-titanium steel and preparation method thereof

Abstract

The invention relates to a high-alkalinity and low-reactivity continuous casting mold flux for high-titanium steel, which comprises the following components in terms of mass fraction: CaO 10-17%, SiO 2 26~33%, Al 2 o 3 5~10%, F ‑ 5~10%,Na 2 O 10-15%, MgO 3-6%, (SrO+BaO+ZnO) 15-25%, TiO 2 1~10%, Li 2 O≤2%, C 2~5%, and the rest are unavoidable impurities. The present invention not only reduces SiO 2 activity, reduce the burning loss of Ti element in the continuous casting process; at the same time, it also inhibits the precipitation of high melting point perovskite crystals, ensures the glass property of the mold slag and the absorption capacity of inclusions, thereby reducing the surface quality of the slab.

Description

A kind of high basicity and low reactivity continuous casting mold powder for high titanium steel and preparation method thereof technical field The present invention relates to iron and steel smelting technical field, be specially high basicity low reactivity continuous casting mold slag for high titanium steel and thereof Preparation. Background technique Add the mold slag in the crystallizer, under the high heat environment created by molten steel, gradually heat up and sinter, melt to form a special The fixed melting structure enables it to exert its metallurgical function and ensure the continuous casting process and the quality of the casting billet. Mold powder crystallizes from adding The metallurgical functions performed by the process from the starter to the exit can be attributed to the following five categories: (1) prevent secondary oxidation of molten steel, (2) adiabatic heat preservation, (3) absorb non-metallic inclusions, (4) control the lubricatio...

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Problems solved by technology

In addition, without the addition of fluorine, the amount of crystal precipitation is small, and the heat transfer of the slag film is affected, which is not conducive to the continuous casting process

[0008] It can be seen that there are corresponding defects in the design of the above-mentioned mold flux, either by reducing the SiO 2 content to reduce the reactivity, but this method also reduces the glass property of the mold flux; either a large amount of perovskite may be produced in the continuous casting process, which affects the direct flow; or the reactivity of the mold flux is still high, and the molten steel Ti element burns seriously

So up to now, there is still no continuous casting mold flux that solves the above-mentioned technical problems.

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